/* * Copyright (c) 2000-2018 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #include <mach/kern_return.h> #include <mach/port.h> #include <kern/queue.h> #include <kern/processor.h> #include <kern/thread.h> #include <kern/sched_prim.h> #include <kern/timer.h> #include <machine/config.h> #if CONFIG_SKIP_PRECISE_USER_KERNEL_TIME && !HAS_FAST_CNTVCT int precise_user_kernel_time = 0; #else int precise_user_kernel_time = 1; #endif void timer_init(timer_t timer) { memset(timer, 0, sizeof(*timer)); } uint64_t timer_delta(timer_t timer, uint64_t *prev_in_cur_out) { uint64_t old = *prev_in_cur_out; uint64_t new = *prev_in_cur_out = timer_grab(timer); return new - old; } static void timer_advance(timer_t timer, uint64_t delta) { #if defined(__LP64__) timer->all_bits += delta; #else /* defined(__LP64__) */ extern void timer_advance_internal_32(timer_t timer, uint32_t high, uint32_t low); uint64_t low = delta + timer->low_bits; if (low >> 32) { timer_advance_internal_32(timer, (uint32_t)(timer->high_bits + (low >> 32)), (uint32_t)low); } else { timer->low_bits = (uint32_t)low; } #endif /* defined(__LP64__) */ } void timer_start(timer_t timer, uint64_t tstamp) { timer->tstamp = tstamp; } void timer_stop(timer_t timer, uint64_t tstamp) { timer_advance(timer, tstamp - timer->tstamp); } void timer_update(timer_t timer, uint64_t tstamp) { timer_advance(timer, tstamp - timer->tstamp); timer->tstamp = tstamp; } void timer_switch(timer_t timer, uint64_t tstamp, timer_t new_timer) { timer_advance(timer, tstamp - timer->tstamp); new_timer->tstamp = tstamp; } /* * Update the current processor's thread timer with `tstamp` and switch the * processor's thread timer to `new_timer`. * * Called with interrupts disabled. */ void processor_timer_switch_thread(uint64_t tstamp, timer_t new_timer) { processor_t processor = current_processor(); timer_t timer; /* Update current timer. */ timer = processor->thread_timer; timer_advance(timer, tstamp - timer->tstamp); /* Start new timer. */ processor->thread_timer = new_timer; new_timer->tstamp = tstamp; }